I'm selling some wenge knobs that I made. I've got two sizes: 1 3/4 inch and 1 inch, both fitting a 1/4 inch shaft. They connect through a little metal insert epoxied in with a set screw. I finished these by rubbing a few coats of wax into them to give them a nice natural sheen and feel.
The 1 3/4 inch knobs are going for $25 a pop and the 1 inches for $15.
-Jake N